Specify type of AAR receptacle

[onox]

The tanker's boom now only wants to track receptacles (and drogues only track probes). The patch below makes the A-10 compatible again.

diff --git a/Models/A-10-model.xml b/Models/A-10-model.xml
index 86dbd0b..a707f5a 100644
--- a/Models/A-10-model.xml
+++ b/Models/A-10-model.xml
@@ -207,6 +207,7 @@
                        <offset-x-m type="double">0.9612</offset-x-m>
                        <offset-y-m type="double">0.0</offset-y-m>
                        <offset-z-m type="double">0.6841</offset-z-m>
+            <type type="string">boom</type>
                </refuel>
        </multiplay>